We experimentally map the scaling laws for packing density ((f), solid component volume fraction) of soot aggregates across five orders of magnitude of size (R-g/a, normalized radius of gyration by monomer radius). The (f) - R-g/a scaling relationship evolves through three successive regimes with distinct power-law exponents of -1.20 0.01, -0.58 +/- 0.06, and -1.31 +/- 0.14. The first cross-over agrees with the classical aerosol-to-gel transition theory. This agreement, however, breaks down at the second cross-over point, where a late-stage cluster-cluster aggregation of aerosol gels takes over.(c) 2017 American Association for Aerosol Research
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